纳米TiO2对2种草本植物种子萌发与幼苗生长的影响

Effects of Nano-TiO2 on seed of germination and growth physiology of the two herbs

研究不同浓度(0~800 mg·L^-1)的纳米TiO2对多年生黑麦草(L.perenne)和高羊茅(F.arundinacea)种子萌发及幼苗生长和生理特征的影响,结果显示:当纳米TiO2浓度为200 mg·L^-1时显著提高了黑麦草的发芽势和发芽指数,在100 mg·L^-1时根长、根表面积、根体积、根尖数和鲜重显著高于对照组;当纳米TiO2浓度为100 mg·L^-1时对高羊茅的种子萌发及根系生长具有显著促进作用;不同浓度的纳米TiO2处理均显著降低了黑麦草和高羊茅种子的叶绿素含量。结论:低浓度的纳米TiO2对黑麦草和高羊茅种子萌发和根系的生长有一定的促进作用,但随着纳米TiO2处理浓度的增加,对黑麦草和高羊茅幼苗期的生长有明显的抑制作用。

The effects of different concentrations(0~800 mg·L^-1)of Nano-TiO 2 on the seed germination,seedling growth and physiological characteristics of L.perenne and F.arundinacea were studied.The res ults showed that the germination rate,germination potential and germination index of L.perenne were significantly increased when the concentration of Nano-TiO2 was 200 mg·L^-1.At 100 mg·L^-1,the root length,root surface area,root volume,root tip number and fresh weight of L.perenne were significantly higher than those of the controlled group;When the concentration of Nano-TiO2 was 100 mg·L^-1,the seed germination and root growth of F.arundinacea were significantly promoted;The chlorophyll content of L.perenne and F.arundinacea was significantly reduced by the treatment of different concentrations of Nano-TiO2.The conclusion:Low concentration of Nano-TiO2 can promote seed germination and root growth of L.perenne and F.arundinacea to some extent,but with the increase of Nano-TiO2 treatment concentration,the growth of L.perenne and F.arundinacea at seedling stage is obviously inhibited.